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Project report: Cast slug in 5.56/.223 AR rifle.
Goal: Realize reduction of costs, (estimated to be about 36%, from $.2930 each to $.1882 each) while maintaining full function of rifles and adequate accuracy.
Goal Modifiers:
1. Be...

Why would someone want to replace a part that is working?
If it isn't working, Dillon replaces it, where is the beef with that?
I have had a 550B for over 10 years anyway, never had an issue that Dillon didn't more than take care of....

I am working along some of the same lines as you are. Somewhere along my research I found someone's load for CFE223 which is 19.6 grains. I plan to start my load development there.
I was supposed to do my initial firing today but things didn't...

So, does anyone have any special techniques, tips, voodoo for getting these teeny tiny gas checks started straight on the bases of the cute little slugs?
I am using Lee mold and Hornady gas checks.
Thanks for any advice.
Fyrd

For what is may be worth I have some chronograph records on this topic from 2013.
Lee 452-252-SWC #90356 that drops out at 247 grains with my hard alloy.
Load is 6 grains of Red Dot. All loads gave ‘reasonable accuracy’ (Sorry, I didn’t record...